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Originally Posted by barry12345
Try a little wd40 down the intake with the air filter cover removed. You will need a helper to pre glow and cranking the engine at the end of the glow cycle.
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I have tried that to no avail. It needs more than just the WD40 I suppose. Or perhaps the WD40 is not remaining vapor trough the whole intake and turbo before entering the engine. It has to be vapor to ignite.
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Also there are two check valves in the lift pump.
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Where are these check valves located and can I access them to clean them or whatever? Or do I have to replace the lift pump as an assembly to address a leaking check valve(s)? Not inclined to replace parts that I am not relatively sure need replacement if you know what I mean. But if I can clean them out....
Also, the lift pump is of the "newer" variety, with the black primer rather than the white one that unscrews.
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The clear hose you installed back draining may suggest they are not in the best of shape perhaps. Assuming the relief valve is not totally sealing.
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I'll keep that in mind.
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Remember that you can substitute the lift pump by having someone there to keep activating the primer pump as you crank. The resistance building you felt as you primed up does indicate the relief valve is really not wide open either. You can close off the return line temporarily with no damage to anything if unsure.The lift pump is a constant pressure design.
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Does this mean that there should be static pressure in the system? (meaning when the engine is off, should there still be pressure in the pow pressure system)? Or does it just mean that there is a constant pressure while the engine is cranking/running? Is there a spec for the lift pump pressure that I can measure?
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I guess what am suggesting is to make sure the engine is just capable of firing up as well. Not running it with that questionable oiling issue.
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I will be replacing the damaged oil pan and sump before cranking it any more- with new oil and oil filter in place!
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I am wondering if the last owner played around with the injection pump as well or anything else. You might remove the vacuum hose from he injection pump as well. You just never know what someone else could have done. It may even be helpful if you could get the whole story from him.
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Previous owner has no clue. Good guy and all (heck, he gave me the car!) but he has no clue what the idiot did to his car.
Tell me why the vacuum hose on the IP would cause problems...?
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In a way it sounds like a bad lift pump. Yet if you see fuel exiting the return fitting when cranking it is still good enough.
Reduced to basics. The engine was running when the pan was damaged. If bad enough to restrict the oil supply is the question. When you crank the engine does the oil pressure gauge go full up? . Then that episode would have no bearing on the fuel system. It is illogical for him to have been working on the fuel system with an oil supply issue.. So things do not really add up. Or at least to me. You have to keep this in mind.
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The oil pressure gauge does not move when cranking. That is what led me to investigate that problem and I found the pan caved in. The damage was not so much as to break any of the aluminum parts to the oil pump in the pan, just destroyed the rubber sump pickup and screen.
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You do not want to change that oil pan until you know the engine is good. Or as much as possible. You have to pull the block to do it. Although apparently some have managed it without doing that I understand. If you can get oil pressure while cranking testing first is the reasonable approach. I suspect it is present and he just drove the car until another unrelated problem developed perhaps.
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I am pretty confident that the pan damage happened right around the time the car stopped running. There is no oil residue on the fragments of rock or on the gouges in the metal of the pan. Believe me, if there had been much run time on the car after the pan got damaged, it would have gotten oil residue on it.
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Incidentally even ugly as sin these days I suppose. The 1985 and 1986 jetta turbo diesels where the best and simplest cars I ever owned. I put so many miles on an 85 I actually got sick of driving it. Yet if I came upon a a clean low milage unrusted example today I would probably pick it up.
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I liked that Jetta and regret having sold it. I don't really care what a car looks like if it is reliable and gets good mileage.. I am not the vain sort. Hell, I drove a Peugeot 504 for Pete's sake! I have no pride.